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-rw-r--r--ext/tk/lib/tkextlib/iwidgets/scrolledcanvas.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/ext/tk/lib/tkextlib/iwidgets/scrolledcanvas.rb b/ext/tk/lib/tkextlib/iwidgets/scrolledcanvas.rb
index 42368f5a56..935e04bbcc 100644
--- a/ext/tk/lib/tkextlib/iwidgets/scrolledcanvas.rb
+++ b/ext/tk/lib/tkextlib/iwidgets/scrolledcanvas.rb
@@ -17,7 +17,7 @@ end
class Tk::Iwidgets::Scrolledcanvas
TkCommandNames = ['::iwidgets::scrolledcanvas'.freeze].freeze
WidgetClassName = 'Scrolledcanvas'.freeze
- WidgetClassNames[WidgetClassName] = self
+ WidgetClassNames[WidgetClassName] ||= self
################################